CVE-2013-1429 in lintian
Summary
by MITRE
Lintian before 2.5.12 allows remote attackers to gather information about the "host" system using crafted symlinks.
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Analysis
by VulDB Data Team • 02/05/2024
The vulnerability identified as CVE-2013-1429 affects Lintian versions prior to 25.12, representing a significant information disclosure flaw that enables remote attackers to extract sensitive system information from the host environment. This issue stems from inadequate handling of symbolic links within the Lintian utility, which is designed to check debian packages for common errors and policy violations. The vulnerability specifically manifests when Lintian processes crafted symbolic links that point to sensitive system files or directories, allowing attackers to traverse the filesystem and gather information about the underlying host system.
The technical flaw resides in the insufficient validation and sanitization of symbolic link paths within Lintian's file processing routines. When Lintian encounters a crafted symlink, it fails to properly resolve or validate the target path, potentially leading to unintended file access or directory traversal. This behavior creates an information exposure condition where attackers can construct malicious symlinks that, when processed by Lintian, reveal system configuration details, file contents, or directory structures that should remain confidential. The vulnerability operates at the filesystem level and exploits the trust relationship between the package checking utility and the files it examines, making it particularly dangerous in automated build environments where Lintian might process untrusted package contents.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can provide attackers with valuable reconnaissance data that may be used in subsequent attacks. An attacker who can manipulate package contents or gain access to package building environments can leverage this vulnerability to gather system-specific information such as installed software versions, system paths, user configurations, or even sensitive file contents. This information can significantly aid in crafting more sophisticated attacks, potentially leading to privilege escalation or other security breaches. The vulnerability is particularly concerning in continuous integration environments where automated package validation processes might inadvertently process malicious packages containing crafted symlinks.
Mitigation strategies for CVE-2013-1429 focus primarily on updating to Lintian version 2.5.12 or later, which includes proper symlink handling and validation mechanisms. Organizations should implement strict package validation procedures that include scanning for potentially malicious symlinks before processing packages through Lintian. The fix typically involves enhancing path resolution logic to properly handle symbolic links and implement proper access controls when traversing filesystem structures. Security practitioners should also consider implementing additional monitoring and logging around package processing activities to detect anomalous symlink behavior. This vulnerability aligns with CWE-22, which addresses improper limitation of a pathname to a restricted directory, and relates to ATT&CK technique T1083, which covers discovering file and directory permissions. Organizations should also review their package building and validation processes to ensure that untrusted packages are properly sanitized before being processed by security tools like Lintian, implementing principle of least privilege access controls and maintaining up-to-date security patches across all system components.